1. What Is CFM Of Compressor?

CFM (Cubic Feet Per Minute) measures the volume of air flow a compressor can deliver. It indicates the compressor's capacity to power air tools and equipment effectively.

2. How Does The Calculator Work?

The calculator uses the CFM equation:

Where:

• \( Displacement \) — Compressor displacement in cubic inches (in³)
• \( RPM \) — Rotational speed in revolutions per minute
• \( Efficiency \) — Volumetric efficiency as a decimal (typically 0.7-0.9)
• \( 1728 \) — Conversion factor (12³) from cubic inches to cubic feet

Explanation: The formula calculates theoretical air delivery based on compressor geometry and speed, then applies efficiency to get actual performance.

3. Importance Of CFM Calculation

Details: Accurate CFM calculation is essential for selecting the right compressor for specific applications, ensuring adequate air supply for tools, and optimizing system performance.

4. Using The Calculator

Tips: Enter displacement in cubic inches, RPM value, and efficiency as a decimal (e.g., 0.85 for 85% efficiency). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is compressor displacement?
A: Displacement is the theoretical volume of air the compressor can move per revolution, based on piston area and stroke.

Q2: What is typical compressor efficiency?
A: Most compressors have 70-90% volumetric efficiency, depending on design, age, and maintenance condition.

Q3: Why is CFM important for air tools?
A: Air tools have specific CFM requirements. Insufficient CFM causes pressure drops and poor tool performance.

Q4: How does altitude affect CFM?
A: At higher altitudes, air density decreases, reducing actual CFM delivery. Compressors may need derating.

Q5: What's the difference between CFM and SCFM?
A: CFM measures actual flow, while SCFM (Standard CFM) measures flow at standard conditions (68°F, 36% humidity, sea level).